1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * This code is issued under the GNU General Public License.
5 * See the file COPYING in this distribution
7 * Copyright (C) 1992, 1993, 1994, 1995
8 * Remy Card (card@masi.ibp.fr)
9 * Laboratoire MASI - Institut Blaise Pascal
10 * Universite Pierre et Marie Curie (Paris VI)
14 * linux/fs/ext2/namei.c
16 * Copyright (C) 1991, 1992 Linus Torvalds
18 * Big-endian to little-endian byte-swapping/bitmaps by
19 * David S. Miller (davem@caip.rutgers.edu), 1995
20 * Directory entry file type support and forward compatibility hooks
21 * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
23 * Changes for use in OBDFS
24 * Copyright (c) 1999, Seagate Technology Inc.
25 * Copyright (C) 2001, Cluster File Systems, Inc.
26 * Rewritten based on recent ext2 page cache use.
31 #include <linux/locks.h>
32 #include <linux/quotaops.h>
34 #define DEBUG_SUBSYSTEM S_LLITE
36 #include <linux/obd_support.h>
37 #include <linux/lustre_lite.h>
38 #include <linux/lustre_dlm.h>
39 extern struct address_space_operations ll_aops;
42 extern void ll_change_inode(struct inode *inode);
43 extern int ll_setattr(struct dentry *de, struct iattr *attr);
46 extern int ll_add_link (struct dentry *dentry, struct inode *inode);
47 ino_t ll_inode_by_name(struct inode * dir, struct dentry *dentry, int *typ);
48 int ext2_make_empty(struct inode *inode, struct inode *parent);
49 struct ext2_dir_entry_2 * ext2_find_entry (struct inode * dir,
50 struct dentry *dentry, struct page ** res_page);
51 int ext2_delete_entry (struct ext2_dir_entry_2 * dir, struct page * page );
52 int ext2_empty_dir (struct inode * inode);
53 struct ext2_dir_entry_2 * ext2_dotdot (struct inode *dir, struct page **p);
54 void ext2_set_link(struct inode *dir, struct ext2_dir_entry_2 *de,
55 struct page *page, struct inode *inode);
58 * Couple of helper functions - make the code slightly cleaner.
60 static inline void ext2_inc_count(struct inode *inode)
65 /* postpone the disk update until the inode really goes away */
66 static inline void ext2_dec_count(struct inode *inode)
71 static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
74 err = ll_add_link(dentry, inode);
76 d_instantiate(dentry, inode);
79 ext2_dec_count(inode);
85 static int ll_find_inode(struct inode *inode, unsigned long ino, void *opaque)
87 struct mds_body *body = (struct mds_body *)opaque;
89 if (inode->i_generation != body->generation)
95 extern struct dentry_operations ll_d_ops;
97 int ll_lock(struct inode *dir, struct dentry *dentry,
98 struct lookup_intent *it, struct lustre_handle *lockh)
100 struct ll_sb_info *sbi = ll_i2sbi(dir);
103 if ((it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_SETATTR |
105 err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT,
106 it, LCK_PW, dir, dentry, lockh, 0, NULL, 0,
108 else if (it->it_op & (IT_READDIR | IT_GETATTR | IT_OPEN))
109 err = mdc_enqueue(&sbi->ll_mdc_conn, LDLM_MDSINTENT,
110 it, LCK_PR, dir, dentry, lockh, 0, NULL, 0,
118 int ll_unlock(__u32 mode, struct lustre_handle *lockh)
120 struct ldlm_lock *lock;
123 lock = lustre_handle2object(lockh);
124 ldlm_lock_decref(lock, mode);
129 static struct dentry *ll_lookup2(struct inode * dir, struct dentry *dentry,
130 struct lookup_intent *it)
132 struct ptlrpc_request *request = NULL;
133 struct inode * inode = NULL;
134 struct ll_sb_info *sbi = ll_i2sbi(dir);
135 struct ll_inode_md md;
136 struct lustre_handle lockh;
137 int err, type, offset;
142 CDEBUG(D_INFO, "name: %*s, intent op: %d\n", dentry->d_name.len,
143 dentry->d_name.name, it->it_op);
145 if (dentry->d_name.len > EXT2_NAME_LEN)
146 RETURN(ERR_PTR(-ENAMETOOLONG));
148 err = ll_lock(dir, dentry, it, &lockh);
149 memcpy(it->it_lock_handle, &lockh, sizeof(lockh));
151 if ( (it->it_op & (IT_CREAT | IT_MKDIR | IT_SYMLINK | IT_MKNOD)) &&
152 it->it_disposition && !it->it_status)
153 GOTO(negative, NULL);
155 if ( (it->it_op & (IT_GETATTR)) &&
156 it->it_disposition && it->it_status)
157 GOTO(negative, NULL);
159 if (!it->it_disposition) {
160 struct ll_inode_info *lli = ll_i2info(dir);
161 memcpy(&lli->lli_intent_lock_handle, &lockh, sizeof(lockh));
163 ino = ll_inode_by_name(dir, dentry, &type);
165 err = mdc_getattr(&sbi->ll_mdc_conn, ino, type,
166 OBD_MD_FLNOTOBD|OBD_MD_FLBLOCKS, 0, &request);
168 CERROR("failure %d inode %ld\n", err, (long)ino);
169 ptlrpc_free_req(request);
170 RETURN(ERR_PTR(-abs(err)));
174 struct mds_body *body;
177 request = (struct ptlrpc_request *)it->it_data;
178 body = lustre_msg_buf(request->rq_repmsg, 1);
183 if (request->rq_repmsg->bufcount < offset + 2 ||
184 request->rq_repmsg->buflens[offset + 1] !=
188 md.obdo = lustre_msg_buf(request->rq_repmsg, offset + 1);
192 md.body = lustre_msg_buf(request->rq_repmsg, offset);
194 inode = iget4(dir->i_sb, ino, ll_find_inode, &md);
196 if (it->it_op & IT_RENAME)
197 it->it_data = dentry;
199 ptlrpc_free_req(request);
201 RETURN(ERR_PTR(-ENOMEM));
205 dentry->d_op = &ll_d_ops;
206 d_add(dentry, inode);
210 static struct inode *ll_create_node(struct inode *dir, const char *name,
211 int namelen, const char *tgt, int tgtlen,
212 int mode, __u64 extra,
213 struct lookup_intent *it, struct obdo *obdo)
216 struct ptlrpc_request *request = NULL;
217 struct mds_body *body;
219 time_t time = CURRENT_TIME;
220 struct ll_sb_info *sbi = ll_i2sbi(dir);
221 struct ll_inode_md md;
225 if (!it->it_disposition) {
226 rc = mdc_create(&sbi->ll_mdc_conn, dir, name, namelen, tgt,
227 tgtlen, mode, current->fsuid,
228 current->fsgid, time, extra, obdo, &request);
233 body = lustre_msg_buf(request->rq_repmsg, 0);
236 request = it->it_data;
237 body = lustre_msg_buf(request->rq_repmsg, 1);
241 body->valid = (__u32)OBD_MD_FLNOTOBD;
244 body->atime = body->ctime = body->mtime = time;
245 body->uid = current->fsuid;
246 body->gid = current->fsgid;
251 inode = iget4(dir->i_sb, body->ino, ll_find_inode, &md);
253 CERROR("new_inode -fatal: %ld\n", PTR_ERR(inode));
254 inode = ERR_PTR(-EIO);
259 if (!list_empty(&inode->i_dentry)) {
260 CERROR("new_inode -fatal: inode %d, ct %d lnk %d\n",
261 body->ino, atomic_read(&inode->i_count),
265 inode = ERR_PTR(-EIO);
271 ptlrpc_free_req(request);
275 int ll_mdc_unlink(struct inode *dir, struct inode *child,
276 const char *name, int len)
278 struct ptlrpc_request *request = NULL;
280 struct ll_sb_info *sbi = ll_i2sbi(dir);
284 err = mdc_unlink(&sbi->ll_mdc_conn, dir, child,
285 name, len, &request);
286 ptlrpc_free_req(request);
291 int ll_mdc_link(struct dentry *src, struct inode *dir,
292 const char *name, int len)
294 struct ptlrpc_request *request = NULL;
296 struct ll_sb_info *sbi = ll_i2sbi(dir);
300 err = mdc_link(&sbi->ll_mdc_conn, src, dir, name,
302 ptlrpc_free_req(request);
307 int ll_mdc_rename(struct inode *src, struct inode *tgt,
308 struct dentry *old, struct dentry *new)
310 struct ptlrpc_request *request = NULL;
311 struct ll_sb_info *sbi = ll_i2sbi(src);
316 err = mdc_rename(&sbi->ll_mdc_conn, src, tgt,
317 old->d_name.name, old->d_name.len,
318 new->d_name.name, new->d_name.len, &request);
319 ptlrpc_free_req(request);
325 * By the time this is called, we already have created
326 * the directory cache entry for the new file, but it
327 * is so far negative - it has no inode.
329 * If the create succeeds, we fill in the inode information
330 * with d_instantiate().
333 static int ll_create(struct inode * dir, struct dentry * dentry, int mode)
339 if (dentry->d_it->it_disposition == 0) {
340 memset(&oa, 0, sizeof(oa));
341 oa.o_valid = OBD_MD_FLMODE;
342 oa.o_mode = S_IFREG | 0600;
343 rc = obd_create(ll_i2obdconn(dir), &oa);
348 mode = mode | S_IFREG;
349 CDEBUG(D_DENTRY, "name %s mode %o o_id %lld\n",
350 dentry->d_name.name, mode, (unsigned long long)oa.o_id);
351 inode = ll_create_node(dir, dentry->d_name.name, dentry->d_name.len,
352 NULL, 0, mode, 0, dentry->d_it, &oa);
356 CERROR("error creating MDS object for id %Ld: rc = %d\n",
357 (unsigned long long)oa.o_id, rc);
358 GOTO(out_destroy, rc);
361 // XXX clean up the object
362 inode->i_op = &ll_file_inode_operations;
363 inode->i_fop = &ll_file_operations;
364 inode->i_mapping->a_ops = &ll_aops;
366 if (dentry->d_it->it_disposition) {
367 struct ll_inode_info *ii = ll_i2info(inode);
368 ii->lli_flags |= OBD_FL_CREATEONOPEN;
369 memcpy(&ii->lli_intent_lock_handle,
370 dentry->d_it->it_lock_handle,
371 sizeof(struct lustre_handle));
374 /* no directory data updates when intents rule */
375 if (dentry->d_it->it_disposition == 0)
376 rc = ext2_add_nondir(dentry, inode);
378 d_instantiate(dentry, inode);
382 rc = obd_destroy(ll_i2obdconn(dir), &oa);
384 CERROR("error destroying object %Ld in error path: err = %d\n",
385 (unsigned long long)oa.o_id, rc);
389 static int ll_mknod(struct inode *dir, struct dentry *dentry, int mode,
392 struct inode * inode = ll_create_node(dir, dentry->d_name.name,
393 dentry->d_name.len, NULL, 0,
394 mode, rdev, NULL, NULL);
395 int err = PTR_ERR(inode);
396 if (!IS_ERR(inode)) {
397 init_special_inode(inode, mode, rdev);
398 err = ext2_add_nondir(dentry, inode);
403 static int ll_symlink(struct inode *dir, struct dentry *dentry,
406 int err = -ENAMETOOLONG;
407 unsigned l = strlen(symname);
408 struct inode * inode;
409 struct ll_inode_info *oinfo;
414 inode = ll_create_node(dir, dentry->d_name.name,
415 dentry->d_name.len, symname, l,
416 S_IFLNK | S_IRWXUGO, 0, dentry->d_it, NULL);
417 err = PTR_ERR(inode);
421 oinfo = ll_i2info(inode);
423 inode->i_op = &ll_fast_symlink_inode_operations;
424 memcpy(oinfo->lli_inline, symname, l);
427 err = ext2_add_nondir(dentry, inode);
430 ext2_dec_count(inode);
436 static int ll_link(struct dentry * old_dentry, struct inode * dir,
437 struct dentry *dentry)
440 struct inode *inode = old_dentry->d_inode;
442 if (S_ISDIR(inode->i_mode))
445 if (inode->i_nlink >= EXT2_LINK_MAX)
448 err = ll_mdc_link(old_dentry, dir,
449 dentry->d_name.name, dentry->d_name.len);
455 inode->i_ctime = CURRENT_TIME;
456 ext2_inc_count(inode);
457 atomic_inc(&inode->i_count);
459 return ext2_add_nondir(dentry, inode);
462 static int ll_mkdir(struct inode * dir, struct dentry * dentry, int mode)
464 struct inode * inode;
468 if (dir->i_nlink >= EXT2_LINK_MAX)
473 inode = ll_create_node (dir, dentry->d_name.name,
474 dentry->d_name.len, NULL, 0,
475 S_IFDIR | mode, 0, dentry->d_it, NULL);
476 err = PTR_ERR(inode);
480 inode->i_op = &ll_dir_inode_operations;
481 inode->i_fop = &ll_dir_operations;
482 inode->i_mapping->a_ops = &ll_aops;
484 ext2_inc_count(inode);
486 err = ext2_make_empty(inode, dir);
490 /* no directory data updates when intents rule */
491 if (dentry->d_it->it_disposition == 0) {
492 err = ll_add_link(dentry, inode);
497 d_instantiate(dentry, inode);
503 ext2_dec_count(inode);
504 ext2_dec_count(inode);
513 static int ll_unlink(struct inode * dir, struct dentry *dentry)
515 struct inode * inode = dentry->d_inode;
516 struct ext2_dir_entry_2 * de;
520 de = ext2_find_entry (dir, dentry, &page);
524 err = ll_mdc_unlink(dir, dentry->d_inode,
525 dentry->d_name.name, dentry->d_name.len);
529 err = ext2_delete_entry (de, page);
533 inode->i_ctime = dir->i_ctime;
534 ext2_dec_count(inode);
540 static int ll_rmdir(struct inode * dir, struct dentry *dentry)
542 struct inode * inode = dentry->d_inode;
543 int err = -ENOTEMPTY;
545 if (ext2_empty_dir(inode)) {
546 err = ll_unlink(dir, dentry);
549 ext2_dec_count(inode);
556 static int ll_rename (struct inode * old_dir, struct dentry * old_dentry,
557 struct inode * new_dir, struct dentry * new_dentry )
559 struct inode * old_inode = old_dentry->d_inode;
560 struct inode * new_inode = new_dentry->d_inode;
561 struct page * dir_page = NULL;
562 struct ext2_dir_entry_2 * dir_de = NULL;
563 struct page * old_page;
564 struct ext2_dir_entry_2 * old_de;
567 if (new_dentry->d_it) {
568 struct ptlrpc_request *req = new_dentry->d_it->it_data;
569 err = req->rq_status;
573 err = ll_mdc_rename(old_dir, new_dir, old_dentry, new_dentry);
577 old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
581 if (S_ISDIR(old_inode->i_mode)) {
583 dir_de = ext2_dotdot(old_inode, &dir_page);
589 struct page *new_page;
590 struct ext2_dir_entry_2 *new_de;
593 if (dir_de && !ext2_empty_dir (new_inode))
597 new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
600 ext2_inc_count(old_inode);
601 ext2_set_link(new_dir, new_de, new_page, old_inode);
602 new_inode->i_ctime = CURRENT_TIME;
604 new_inode->i_nlink--;
605 ext2_dec_count(new_inode);
609 if (new_dir->i_nlink >= EXT2_LINK_MAX)
612 ext2_inc_count(old_inode);
613 err = ll_add_link(new_dentry, old_inode);
615 ext2_dec_count(old_inode);
619 ext2_inc_count(new_dir);
622 ext2_delete_entry (old_de, old_page);
623 ext2_dec_count(old_inode);
626 ext2_set_link(old_inode, dir_de, dir_page, new_dir);
627 ext2_dec_count(old_dir);
634 page_cache_release(dir_page);
638 page_cache_release(old_page);
643 struct inode_operations ll_dir_inode_operations = {